Definitely check out local guilds. My guild has a table and you can bring in anything you want to move along; fabric, books, kits, yarn, patterns, blocks that are odds and ends you don’t want any more. I have been able to pick up scraps of colors I rarely use, but sometimes need just a bit of. And one person’s trash is another person’s treasure. We also have a “garage sale” once a year, where you can bring in your extra and misc things, and the guild gets the money to use for charity work, books for our guild library and such.